the scriptengine has an uiReady property

will be used for some experiments later: we can track if the ui
machinery has been correctly initialized.
we'll use that to ensure the applets gets initialized and prepared only
after their containment has been

src/scriptengines/qml/plasmoid/appletinterface.cpp

@@ -185,6 +185,7 @@ void AppletInterface::init()
     }
     geometryChanged(QRectF(), QRectF(x(), y(), width(), height()));
     emit busyChanged();
+    m_appletScriptEngine->setUiReady(true);
 }
 
 Plasma::Types::FormFactor AppletInterface::formFactor() const

src/scriptengines/qml/plasmoid/declarativeappletscript.cpp

@@ -56,7 +56,8 @@ K_EXPORT_PLASMA_APPLETSCRIPTENGINE(declarativeappletscript, DeclarativeAppletScr
 
 DeclarativeAppletScript::DeclarativeAppletScript(QObject *parent, const QVariantList &args)
     : Plasma::AppletScript(parent),
-      m_interface(0)
+      m_interface(0),
+      m_uiReady(false)
 {
     qmlRegisterType<AppletInterface>();
     qmlRegisterType<ConfigPropertyMap>();
@@ -114,6 +115,21 @@ void DeclarativeAppletScript::constraintsEvent(Plasma::Types::Constraints constr
     }
 }
 
+void DeclarativeAppletScript::setUiReady(bool ready)
+{
+    if (m_uiReady == ready) {
+        return;
+    }
+
+    m_uiReady = ready;
+    emit uiReadyChanged(ready);
+}
+
+bool DeclarativeAppletScript::isUiReady() const
+{
+    return m_uiReady;
+}
+
 void DeclarativeAppletScript::activate()
 {
 #if 0

src/scriptengines/qml/plasmoid/declarativeappletscript.h

@@ -45,6 +45,9 @@ public:
 
     void constraintsEvent(Plasma::Types::Constraints constraints);
 
+    void setUiReady(bool ready);
+    bool isUiReady() const;
+
 public Q_SLOTS:
     void executeAction(const QString &name);
     void activate();
@@ -56,9 +59,11 @@ Q_SIGNALS:
     void formFactorChanged();
     void locationChanged();
     void contextChanged();
+    void uiReadyChanged(bool ready);
 
 private:
     AppletInterface *m_interface;
+    bool m_uiReady;
     friend class AppletInterface;
 };